package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author amanda
 * @Description
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // TODO 1.获取请求头的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }
        // TODO 2.基于token获取redis中的用户信息
        String tokenKey = RedisConstants.LOGIN_USER_KEY+token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(tokenKey);
        // 判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
        // TODO 3.将查询到的Hash对象转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        // TODO 4.存在，保存ThreadLocal
        UserHolder.saveUser(userDTO);
        // TODO 5.更新token
        stringRedisTemplate.expire(tokenKey,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        UserHolder.removeUser();
    }
}
